github.com/drone/go-convert@v0.0.0-20240307072510-6bd371c65e61/internal/store/store.go (about)

     1  // Copyright 2022 Harness, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package store
    16  
    17  import "strconv"
    18  
    19  // Identifiers stores identifiers.
    20  type Identifiers struct {
    21  	store map[string]struct{}
    22  }
    23  
    24  // New returns a new identifier store.
    25  func New() *Identifiers {
    26  	return &Identifiers{
    27  		store: map[string]struct{}{},
    28  	}
    29  }
    30  
    31  // Register registers a name with the store.
    32  func (s *Identifiers) Register(name string) bool {
    33  	if _, ok := s.store[name]; ok {
    34  		return false
    35  	}
    36  	s.store[name] = struct{}{}
    37  	return true
    38  }
    39  
    40  // Generage generates and registeres a unique name with the
    41  // store. If the base name is already registered, a unique
    42  // suffix is appended to the name.
    43  func (s *Identifiers) Generate(name ...string) string {
    44  	var base string
    45  	// choose the first non-empty name.
    46  	for _, s := range name {
    47  		if s != "" {
    48  			base = s
    49  			break
    50  		}
    51  	}
    52  
    53  	// register the name as-is
    54  	if s.Register(base) {
    55  		return base
    56  	}
    57  	// append a suffix to the name and register
    58  	// the first unique combination.
    59  	for i := 1; ; i++ {
    60  		next := base + strconv.Itoa(i)
    61  		if s.Register(next) {
    62  			return next
    63  		}
    64  	}
    65  }